DC motor control circuit using NE555

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Description.

A simple DC motor controller circuit using NE555 is shown here. Many DC motor speed control circuits have been published here but this is the first one using NE555 timer IC. In addition to controlling the motors speed its direction of rotation can be also changed using this circuit.

A PWM circuit based on timer NE555 is the heart of this circuit. NE555 is wired as an astable multivibrator whose duty cycle can be adjusted by varying the POT R1. The output of IC1 is coupled to the base of transistor Q1 which drives the motor according to the PWM signal available at its base. Higher the duty cycle the average voltage across motor will be high which results in higher motor speed and vice versa. Change of DC motor direction is attained using the DPDT switch S1 which on application just toggles the polarity applied to the motor.

Circuit diagram of DC motor controller.

DC motor controller using NE555

Notes.

The circuit can be assembled on a Vero board or PCB.

Use 12V DC for powering the IC.

Vm is the power supply for motor and its value depends on the motors voltage rating. Any way maximum Vceo for BD139 is 80V and so Vm should not be exceeded 80 volts.

Maximum collector current BD139 can handle is 1.5A and so do not use a motor that consumes more than 1.5 amperes of current.

Hi..!! actually in this circuit PWM (pulse width modulation) technique is used to rotate motor. This can be done in two ways :
1) by controlling armature voltage (as done in this circuit)
2) by controlling field current.

So far as ne555 is concerned, it is used to provide pulse as PWM technique is used. With the help of var-resistor, the pulse width is adjusted to obtain required speed.

Hi..I want to make a motorised tray that can work on 12 V DC…I want the tray to operate with a single button…I.e…I want the motor to work back and fro with a single button..please somebody help me…..thanks

I’m looking for a simple DC motor controller where i can change the direction of rotation very quickly to simulate a galvanometer. This schematic would be good for this but i don’t now how replace the DPDT with electronics components.
Anybody can help me?

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